John has to cut some wood. First, he used a large, blunt saw and cut 3 pieces in 2 minutes. Then he used a smaller, sharper saw and cut 5 pieces in 2 minutes. Explain which saw was more efficient.

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)